IHIS. 



tog 



( tin- hybrid to either parent or to intermediate- 

 nwa. In fact, there in an infliiiatimi f. r :!n- parental 

 * to be paired m th.-ir courae and for t < hybrid 



to be distinctly above or below the parental curves. 

 In tin- chromic ncnl nrti<>na there ii well-mrk<-.| m- 



Imtciu'M of tin- hybrid, an. I in those with potas- 

 wum, iodine, aodium ul|ihid<*. and cupnc rhl<>nd<- 

 transient fatonMdfafcBMi during the first 5 minntea; 

 Inn in this group, with the ex|.ii..n <( the potassium 

 iodide reaction, tin- difTeranoea in the curves of the three 

 starches are (light and fall within the limits of error of 

 experiment 



(2) The lower reactivity of /. ctngtalli in compari- 

 son with the other parent in the reactions with chloral 

 hydrate and sodium salicvlat.-; the higher reactivities in 

 those with chromic acid, pyrogallic acid, potassium io- 

 dide, uranium nitrate, strontium nitrate, and copper 

 nitraU-; the name or nearly the name rea-tmtie* with 

 hydrochloric acid, potaMium hydroxide, potassium sul- 

 phocyanate, sodium hydroxide, sodium sulphide, cslcium 

 nitrate, cupric chloride, and mercuric chloride; and 

 the same reactivities also with nitric arid, sulphuric acid, 

 potassium sulphide, cobalt nitrate, and barium chloride, 

 in which the reactivities of all three starches are the 

 same or practically the same. 



(3) The curves of the hybrid bear varying relations 

 to the parental curves. The absence of sameness in any 

 instance to the seed parent, the slni<'.-t entire ttlisence of 

 inarmed iatenefw of the curve, and the \ery marked ten- 

 dency to the curve being the highest or lowest of the 

 three are very striking. This low tendency is a most 

 interesting peculiarity considering- the very close rela- 

 tionship of the parents, and it recalls the same l.ut 

 more marked peculiarity of the hybrids of the well- 

 separated parents Amaryllis btlladonna and Brunsi-igia 

 josephina. 



(4) In a few reactions there is evidence of an early 

 period of resistance, and this may I* noticeable in regard 

 to one or more of three starches in any reaction. This 

 resistance is seen in all three starches in the reactions 

 with chloral hydrate, chromic acid, pyrogallic acid, nitric 

 acid, strontium nitrate, and cupric chloride; with /. ctn- 

 gialli in the sodium-sulphide reaction ; with both parents 

 in that with calcium nitrate; and with the hybrid in 

 that with cupric chloride particularly. 



(5) The earliest period during the 60 minute* at 

 which the three curves are best separated to differentiate 

 the starches varies with the different reagents. Approxi- 

 mately, this period occurs within 5 minutes in the reac- 

 tions with nitric acid, sulphuric acid, potassium hydrox- 

 ide, potassium iodide, potassium sulphocyanate, sodium 

 hydroxide, and sodium salicylate reactions; at 15 min- 

 utes with chloral hydrate, chromic acid, pyrogallic acid, 

 hydrochloric acid, sodium sulphide, calcium nitrate, and 

 strontium nitrate ; at 30 minutes with copper nitrate and 

 cupric chloride ; and at 60 minutes with potassium sul- 

 phide, uranium nitrate, cobalt nitrate, barium chloride, 

 and mercuric chloride. In a number of cases the assign- 

 ment is very questionable, so that the classification most 

 be looked upon as having merely a tentative value. 



REACTION-INTENSITIES OF THE HTMJD. 



This section treats of the reaction-intensities of the 

 liybrid as regards ismeneas, intermediateneas, excess, and 

 in relation tn the parents. (Table A 32 and 

 Charts D 421 to D 4-1 1 > 



The reactivities of the hybrid are the same as those 

 of the seed parent in no reaction ; the same aa those of 

 the pollen parent in that with cobalt nitrate ; the same 

 as those of both parents in those with nitric acid, sul- 

 phuric acid, and barium chloride, in all of which the 



